Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jan. 31, 2021	Jul. 31, 2020	Jan. 31, 2020	Apr. 30, 2021
Accounting Policies [Abstract]
Cash equivalents	$ 0				$ 0
Net income (loss)	(172)	$ (172)	$ 75	$ 75
Net cash provided by (used in) operating activities	216		(715)
Accumulated deficit	72,702				72,530
Working capital	919
Cash and cash equivalents	3,998				4,687
Unrecognized tax benefits	181				181
Accrued income tax penalties and interest	3				$ 3
Income tax penalties and interest expense	0		0
Unrecognized tax benefits anticipated during the next 12 months	0
Provision for income taxes	$ 14		$ 13